Improvement in steam-engines



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Letters .Patent No. 78,853, dated June 9, 186.8; aritedated Marel: 31, 1868.

IMPROVEMENT IN STEAM-ENGINES.

@In fhehnle rcfrmb In in tlgrse ntima ntnzt mit .nmking vnari nf tige salmi TO ALL WHOM IT MAY .CONGERN Be it known that we, DE VoLsoN Woon and STILLMAN W. ROBINSON, both ofthe city oi` Ann Arbor, county of Washtenow, and Stateof Michigan, have invented new und useful Improvements on Machines for Drilling Rocks. Chaunelling and Cutting Stone and we do hereby declare that the i'clloviin'g is a. fullJ cleartandwexnnn Y descriptionof the construction and operation of the same, referencebeing had tothe annexed drawings, .making 4o. part of this specification, ih which- Figure 1 is a longitudinal section through thercente of the piston-rod and steam-passages.

Figure 2 is a, cross-section through F G ofi Iig. 1.

Our improvement consists in so constructing the cylinder-heads, that the piston-rod L, piston N, enlarge- .ment K, for the tool-holder, anden enlargement at the vrem' end ifnecessary, may -be a. single solid piece. They are constructed as follons: A shox-I: cylindrical nnnulus, composed of two or more segmental pieces A A, and fitted to the bore of the cylinder, and the rod L is entered the cylinder to serve as n. head, and is heldin place by one or more screws E. '.lhc follower muy be in two parts like n coupling-nut, und the piston packed in the usual way. i

What we claim as new, and desire4 to secure by Letters Patent, s l

The segmental pieces A A, to serve u's n, cylinder-head, substantially us described.

DE VOLSON WOOD, STILLMAN W.' ROBINSON.

Witnesses:

DnnsMonE CRAMER, Asnun. A. TERRY. 

